Differential fluid change - do I need friction modifier?

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pirate air

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Look 2 lines down on the left, *******.


You mean this part, the last sentence specifically?
Contains additional friction modifiers for suitablity with clutch-type limited slip differentials - for most LSDs, no additional friction modifiers are required
 

Ruger

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There's a sweet spot in everything, Wilson. Too slippery and she might not know you're there! :)

OK, this is serious. We have conflicting guidance on this and some of us are maintenance freaks. We need to get an official reading from Ford. HOW???
 

pirate air

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